Official Military letter with royal insignium “C7mus” sent from Odense 7 March 1772 to Husum. The King’s initial sin stylised form with a conventionalized royal crown above, signifies Royal Franking Privilege with certificate. Postal markings list number “1-“ on reverse. From 1 August 1771, a royal regulation announced, that military letters on official matters between the officials were subject to a certificate (Fr. Olsen, page 179.)